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Abnormal Operation (cont’d)
2. Temperature Sensor Fault:
A) Temperature Sensor Open Circuit: The gas control immediately turns off all
outputs and proceeds to flash 8 times then 3 times with a three second pause. The
error self clears if the fault clears for at least 15 seconds.
B) Thermal well sensors not reading the same temperature within ±5.5°F: The gas
control immediately turns off all outputs and proceeds to flash 8 times then 3 times
with three second pause. The error self clears if the fault clears for at least 15
seconds.
C) Water Temperature in excess of ECO (Energy Cut Off) Limit: The gas control
immediately turns off the pilot and main valves. The gas control LED proceeds to
flash 4 times with a 3 second pause.
To reset the gas control, rotate the setpoint knob to the minimum setting for at least
6 seconds before returning to desired temperature setting.
3. Safety Circuit Fault:
A) Safety Circuit Failed to Close: The gas control proceeds to flash 3 times with a 3
second pause. The gas control waits 5 minutes, and then tries to energize the
relay again.
B) Safety Circuit Failed to Open: The gas control proceeds to flash 2 times with a 3
second pause. The gas control waits 5 minutes, and then tries to de-energize
the relay.
4. Trial for Ignition Fault:
A) Relay Fault During Trial: The gas control stops the trial for ignition. The gas
control proceeds to flash 3 times with a 3 second pause. The gas control waits
5 minutes, and then tries to energize the relay again.
B) Flame Not Sensed: The gas control energizes the spark igniter attempting to
light the pilot and prove flame. If flame is not sensed within 90 seconds, the
spark igniter turns off, the pilot valve is closed. The gas control LED flashes 6
times then 1 time with 3 second pause. The control waits 5 minutes before
repeating the ignition sequence.
Sequence of Operation
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